Importance

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Abstract

A system for estimating peak cylinder pressure in an internal combustion engine includes a pressure sensor producing a pressure signal indicative of pressure within an intake manifold of the engine, a temperature sensor producing a temperature signal indicative of temperature within the intake manifold, means for determining a charge fuel ratio corresponding to a ratio of in-cylinder trapped charge mass and in-cylinder trapped fuel mass, and a control computer determining a start-of-injection value corresponding to a start of fuel injection into the engine. The control computer is operable to estimate peak cylinder pressure as a function of the pressure signal, the temperature signal, the charge fuel ratio and the start-of-injection value.

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First Claim